Took my Bersa Thunder .22 out today and shot 100 rounds of Velocitors and Stingers through it.

There were no failures, but often during the first half of a magazine, when I would pull the trigger, the hammer would partially fall (not as far as to a half-cock position), and as I continued to pull the trigger, the hammer would then fall all the way and fire the round.

Don't think it ever happened in the 2nd half of a magazine, but only sometime during the first 5 rounds.  It probably happened in 7 of the 10 magazines I fired.

Ever heard of this before?  It is a new one for me.